c++builder 读写文件类

TStreamReader、TStreamWriter读取一行

http://docwiki.embarcadero.com/CodeExamples/XE8/en/StreamCharRdWr_%28C%2B%2B%29

void __fastcall TMainForm::btSaveClick(TObject *Sender)
{
    TStreamWriter* writer;

    /* Create a new stream writer directly. */
    writer = new TStreamWriter("local_file.txt",
        false, TEncoding::UTF8, 1024);

    /* Store the title and then the text. */
    writer->WriteLine(edtTitle->Text);
    writer->Write(mmText->Text);

    /* Close and Free the writer. */
    delete writer;
}

void __fastcall TMainForm::btLoadClick(TObject *Sender)
{
    TStreamReader* reader;

    /* Create a new stream writer directly. */
    reader = new TStreamReader("local_file.txt",
        TEncoding::UTF8);

    /* Read the title and then the actual text. */
    edtTitle->Text = reader->ReadLine();
    mmText->Text = reader->ReadToEnd();

    /* Close and Free the writer. */
    delete reader;
}

TStringReader、

TStringWriter